autosport.com - F1 News: F1 considers move to V6 turbos
BBC Sport - Formula 1 delays introduction of ‘green’ engines until 2014

if this goes through, it's good news. Postponing it also makes sense. Let's hope all engine manufacturers (and some new ones) like this and keep supplying engines to F1. goodness knows what this means for PURE though, meanwhile it would have made sense to go for the same engine rules as IndyCar, so we could see Honda, Chevvie and Lotus units, but V6T is an improvement on V4T.